Residents in Smithers and Vanderhoof are under an Air Quality Advisory.
The Ministry of Environment along with Northern Health have issued the advisory that will be in effect until further notice.
The step has been taken due to the amount of fine particulate matter in the air.
Wood stove use, unless it is your only source of heating, has been banned.
Residents are being told to avoid strenuous exercise and if possible remain indoors.
Exposure is of concern for infants, those with respiratory or diabetes or heart problems and seniors.